Process of chloridizing roasting of burnt pyrites



July 7, 1925.

J. SIMON PROCESS OF CHLORIDIZING ROASTING 0F BURNT PYRITES Filed 001;. 27, 1920 mi 7. V A v 2 7% x a x o Q 10 0 Q Q 9 0 mu 9 //%f/ d i BY A'TTD RN raw/5 Patented July 7, 1925.

noon smon, or ra'anxroar-on-rnn-mnm, GERMANY, assrenoa mo rm; 1mm

BEER, SONDHEIMER & (20., OF FRANKFORT-ON-THE-MAIN,

PROCESS OF CHLORIDIZING ROASTDTG OI BUBNTPYRITE.

Application filed October 27, 1920. Serial 1T0. 420,068.

To all whom it may concern.

Be it known that I, JACOB SIMON, a citizen of Germany, residing at and whose postofiice address is Frankfort-on-the-Main, Germany, have invented certain new and useful Improvements in Processes of Chloridizing Roasting of Burnt Pyrites (for which I filed an application" in Germany, August. 2, 1917), of which the following is a specification.

The chloridizing roasting of burnt pyrites and the like was formerly carried out in furnaces, of the non-mufiied type, in which the material was raked. Later, rotary chloridizing furnaces, like the Herreshoif furnace, came into use. The Eamen, Beskow and Wedge furnaces were of the rotary type and were of suitable construction for chloridizing roasting. Buddens roasted in a kind of shaft furnace without addition of carbon; his process necessitating continual renewal of the parts of the furnace.

By the present invention the chloridizing roasting is performed, with the addition of from 0 to 2 per cent of coke breeze or coke dust, by blowing air under pressure into a furnace which resembles a rotary grate producer, but which is particularly adapted for the purposes of the invention.

Pyrites have been roasted in a furnace which is similar to the known high pressure gas producer, but such a roasting is an oxiation process, altogether different from the chloridizing roasting with which this invention is concerned. This process of chloridizing roasting of burnt pyrites is conducted, according to the present invention, by roasting, on the counter-current princi lo and in a stationary shaft closed air-tig t, the material mixed with salt and with from 0 to 2 er cent ofcokebreeze, by means of air un er pressure passing upwards, the com letely roasted material belng removed mec anically. This procedure has the particular advantage that it is continuous and essentially more uniform than the processes of chloridizing roasting hitherto known. This has the further result that there is a large yield of soluble co per with a small consumption of salt. oreover, the continuous process requires considerably less power than the known rocesses need.

A suitable furnace or. the process is shown in the accompanying drawing. It

The roasting zone proper is from 10-20 cm. above the point of the grate so that the latter is not burnt. The rising air cools the roasted material, roasts the material in the roasting zone and pre-heats the material above this zone.

The roasted material falls into the rotating gutter b, is removed therefrom by the scraper c and is dischargedthrough the valved hopper d. The control of the air blast and of the speed of rotation of the gutter, as well as the adjustment of the scraper (the furnace is always full) keep.

the roasting zone at the correct level. number of poking holes are provided in the side of the shaft whereby bridging of the material may be prevented.

I claim:

air passes through the lateral pipe f. The air 1. In the chloridizing roasting of burnt.

pyrites and the like, the improvement which comprises progressively passing the charge of material to be chloridized downwardly en-masse through an air-tight stationary shaft, passing a current of air u wardly through the column of charge in a irection opposite to the direction of movement of the c arge, and discharging the roasted material at the bottom of the shaft. 7

2. In the chloridizing roasting of burnt pyrites and the like, the improvement which comprises progressively passing the charge mixed with salt and with carbonaceous material in amount not exceeding about 2% en-masse through an air-tight stationa shaft, and passing a current of air throng the column of charge in a direction opposite to the direction of movement 0 ar 3. the chloridizing roasting of burnt mcluding the material to be chloridized of the pyrites and the like, the improvement which comprises progressively passing the charge including the material to be chloridized mixed with salt and with coke breeze in amount not exceeding about 2% down-- wardly en-masse through an air-tight sta tionary shaft, passing a current of air under pressure upward y through the charge,

and -mechanically removing the roasted charge from nearwthe bottom of the shaft. 10 In testimony whereof I have afiixed my signature in presence of two witnesses.

JACOB SIMON. Witnesses:

HARRY KATZENSTEIN, MAXWEIN. 

